/*
* $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTagLibrary.java,v 1.6 2002/08/01 09:53:18 jstrachan Exp $
* $Revision: 1.6 $
* $Date: 2002/08/01 09:53:18 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: DynamicTagLibrary.java,v 1.6 2002/08/01 09:53:18 jstrachan Exp $
*/
package org.apache.commons.jelly.impl;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.jelly.DynaTag;
import org.apache.commons.jelly.Script;
import org.apache.commons.jelly.Tag;
import org.apache.commons.jelly.TagLibrary;
import org.apache.commons.jelly.impl.DynaTagScript;
import org.apache.commons.jelly.impl.TagFactory;
import org.apache.commons.jelly.impl.TagScript;
import org.xml.sax.Attributes;
/**
* <p><code>DynamicTagLibrary</code> represents a TagLibrary which
* gets created by running a Jelly script.</p>
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.6 $
*/
public class DynamicTagLibrary extends TagLibrary {
private String uri;
private Map templates = new HashMap();
private TagLibrary parent;
public DynamicTagLibrary() {
}
public DynamicTagLibrary(String uri) {
this.uri = uri;
}
/** Creates a new script to execute the given tag name and attributes */
public TagScript createTagScript(final String name, final Attributes attributes)
throws Exception {
return new DynaTagScript(
new TagFactory() {
public Tag createTag() throws Exception {
Tag answer = DynamicTagLibrary.this.createTag(name);
// delegate to my parent instead
if ( answer == null && parent != null ) {
return parent.createTag(name, attributes);
}
return answer;
}
}
);
}
/** Creates a new Tag for the given tag name if it exists */
public Tag createTag(String name)
throws Exception {
Object value = templates.get(name);
if ( value instanceof Script ) {
Script template = (Script) value;
return new DynamicTag(template);
}
else if ( value instanceof TagFactory ) {
TagFactory factory = (TagFactory) value;
return factory.createTag();
}
return null;
}
/**
* Creates a new tag with the given name and template
*/
public void registerDynamicTag(String name, Script template) {
templates.put(name, template);
}
/**
* Creates a new Jelly Bean Tag with the given name
*/
public void registerBeanTag(String name, TagFactory factory) {
templates.put(name, factory);
}
// Properties
//-------------------------------------------------------------------------
public String getUri() {
return uri;
}
public void setUri(String uri) {
this.uri = uri;
}
/**
* Returns the parent library which will be used to resolve unknown tags.
* @return TagLibrary
*/
public TagLibrary getParent() {
return parent;
}
/**
* Sets the parent to inherit tags from that are not defined in this library.
* @param parent The parent to set
*/
public void setParent(TagLibrary parent) {
this.parent = parent;
}
}